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![Alexander Graf](/assets/img/avatar_default.png)
When calling a semctl(IPC_STAT) without IPC_64 the check if the memory is unevaluated. This patch fixes this. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
682 lines
17 KiB
C
682 lines
17 KiB
C
/*
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* 32 bit compatibility code for System V IPC
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*
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
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* Copyright (C) 2000 VA Linux Co
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* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
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* Copyright (C) 2000 Hewlett-Packard Co.
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* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 2000 Gerhard Tonn (ton@de.ibm.com)
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* Copyright (C) 2000-2002 Andi Kleen, SuSE Labs (x86-64 port)
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* Copyright (C) 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 IBM
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* Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Copyright (C) 2004 Arnd Bergmann (arnd@arndb.de)
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*
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* This code is collected from the versions for sparc64, mips64, s390x, ia64,
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* ppc64 and x86_64, all of which are based on the original sparc64 version
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* by Jakub Jelinek.
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*
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*/
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#include <linux/compat.h>
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#include <linux/errno.h>
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#include <linux/highuid.h>
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#include <linux/init.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include "util.h"
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struct compat_msgbuf {
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compat_long_t mtype;
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char mtext[1];
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};
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struct compat_ipc_perm {
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key_t key;
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__compat_uid_t uid;
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__compat_gid_t gid;
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__compat_uid_t cuid;
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__compat_gid_t cgid;
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compat_mode_t mode;
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unsigned short seq;
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};
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struct compat_semid_ds {
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struct compat_ipc_perm sem_perm;
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compat_time_t sem_otime;
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compat_time_t sem_ctime;
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compat_uptr_t sem_base;
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compat_uptr_t sem_pending;
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compat_uptr_t sem_pending_last;
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compat_uptr_t undo;
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unsigned short sem_nsems;
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};
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struct compat_msqid_ds {
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struct compat_ipc_perm msg_perm;
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compat_uptr_t msg_first;
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compat_uptr_t msg_last;
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compat_time_t msg_stime;
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compat_time_t msg_rtime;
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compat_time_t msg_ctime;
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compat_ulong_t msg_lcbytes;
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compat_ulong_t msg_lqbytes;
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unsigned short msg_cbytes;
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unsigned short msg_qnum;
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unsigned short msg_qbytes;
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compat_ipc_pid_t msg_lspid;
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compat_ipc_pid_t msg_lrpid;
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};
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struct compat_shmid_ds {
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struct compat_ipc_perm shm_perm;
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int shm_segsz;
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compat_time_t shm_atime;
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compat_time_t shm_dtime;
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compat_time_t shm_ctime;
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compat_ipc_pid_t shm_cpid;
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compat_ipc_pid_t shm_lpid;
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unsigned short shm_nattch;
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unsigned short shm_unused;
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compat_uptr_t shm_unused2;
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compat_uptr_t shm_unused3;
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};
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struct compat_ipc_kludge {
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compat_uptr_t msgp;
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compat_long_t msgtyp;
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};
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struct compat_shminfo64 {
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compat_ulong_t shmmax;
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compat_ulong_t shmmin;
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compat_ulong_t shmmni;
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compat_ulong_t shmseg;
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compat_ulong_t shmall;
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compat_ulong_t __unused1;
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compat_ulong_t __unused2;
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compat_ulong_t __unused3;
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compat_ulong_t __unused4;
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};
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struct compat_shm_info {
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compat_int_t used_ids;
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compat_ulong_t shm_tot, shm_rss, shm_swp;
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compat_ulong_t swap_attempts, swap_successes;
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};
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extern int sem_ctls[];
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#define sc_semopm (sem_ctls[2])
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static inline int compat_ipc_parse_version(int *cmd)
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{
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int version = *cmd & IPC_64;
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/* this is tricky: architectures that have support for the old
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* ipc structures in 64 bit binaries need to have IPC_64 set
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* in cmd, the others need to have it cleared */
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#ifndef ipc_parse_version
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*cmd |= IPC_64;
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#else
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*cmd &= ~IPC_64;
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#endif
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return version;
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}
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static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
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struct compat_ipc64_perm __user *up64)
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{
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int err;
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err = __get_user(p64->uid, &up64->uid);
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err |= __get_user(p64->gid, &up64->gid);
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err |= __get_user(p64->mode, &up64->mode);
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return err;
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}
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static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
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struct compat_ipc_perm __user *up)
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{
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int err;
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err = __get_user(p->uid, &up->uid);
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err |= __get_user(p->gid, &up->gid);
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err |= __get_user(p->mode, &up->mode);
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return err;
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}
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static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
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struct compat_ipc64_perm __user *up64)
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{
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int err;
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err = __put_user(p64->key, &up64->key);
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err |= __put_user(p64->uid, &up64->uid);
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err |= __put_user(p64->gid, &up64->gid);
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err |= __put_user(p64->cuid, &up64->cuid);
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err |= __put_user(p64->cgid, &up64->cgid);
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err |= __put_user(p64->mode, &up64->mode);
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err |= __put_user(p64->seq, &up64->seq);
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return err;
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}
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static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
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struct compat_ipc_perm __user *up)
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{
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int err;
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__compat_uid_t u;
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__compat_gid_t g;
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err = __put_user(p->key, &up->key);
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SET_UID(u, p->uid);
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err |= __put_user(u, &up->uid);
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SET_GID(g, p->gid);
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err |= __put_user(g, &up->gid);
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SET_UID(u, p->cuid);
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err |= __put_user(u, &up->cuid);
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SET_GID(g, p->cgid);
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err |= __put_user(g, &up->cgid);
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err |= __put_user(p->mode, &up->mode);
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err |= __put_user(p->seq, &up->seq);
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return err;
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}
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static inline int get_compat_semid64_ds(struct semid64_ds *s64,
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struct compat_semid64_ds __user *up64)
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{
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if (!access_ok (VERIFY_READ, up64, sizeof(*up64)))
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return -EFAULT;
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return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
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}
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static inline int get_compat_semid_ds(struct semid64_ds *s,
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struct compat_semid_ds __user *up)
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{
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if (!access_ok (VERIFY_READ, up, sizeof(*up)))
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return -EFAULT;
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return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
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}
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static inline int put_compat_semid64_ds(struct semid64_ds *s64,
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struct compat_semid64_ds __user *up64)
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{
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int err;
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if (!access_ok (VERIFY_WRITE, up64, sizeof(*up64)))
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return -EFAULT;
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err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
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err |= __put_user(s64->sem_otime, &up64->sem_otime);
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err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
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err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
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return err;
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}
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static inline int put_compat_semid_ds(struct semid64_ds *s,
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struct compat_semid_ds __user *up)
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{
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int err;
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if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
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return -EFAULT;
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err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
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err |= __put_user(s->sem_otime, &up->sem_otime);
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err |= __put_user(s->sem_ctime, &up->sem_ctime);
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err |= __put_user(s->sem_nsems, &up->sem_nsems);
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return err;
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}
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long compat_sys_semctl(int first, int second, int third, void __user *uptr)
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{
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union semun fourth;
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u32 pad;
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int err, err2;
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struct semid64_ds s64;
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struct semid64_ds __user *up64;
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int version = compat_ipc_parse_version(&third);
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if (!uptr)
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return -EINVAL;
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if (get_user(pad, (u32 __user *) uptr))
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return -EFAULT;
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if ((third & (~IPC_64)) == SETVAL)
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fourth.val = (int) pad;
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else
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fourth.__pad = compat_ptr(pad);
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switch (third & (~IPC_64)) {
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case IPC_INFO:
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case IPC_RMID:
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case SEM_INFO:
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case GETVAL:
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case GETPID:
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case GETNCNT:
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case GETZCNT:
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case GETALL:
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case SETVAL:
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case SETALL:
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err = sys_semctl(first, second, third, fourth);
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break;
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case IPC_STAT:
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case SEM_STAT:
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up64 = compat_alloc_user_space(sizeof(s64));
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fourth.__pad = up64;
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err = sys_semctl(first, second, third, fourth);
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if (err < 0)
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break;
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if (copy_from_user(&s64, up64, sizeof(s64)))
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err2 = -EFAULT;
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else if (version == IPC_64)
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err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
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else
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err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
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if (err2)
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err = -EFAULT;
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break;
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case IPC_SET:
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if (version == IPC_64) {
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err = get_compat_semid64_ds(&s64, compat_ptr(pad));
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} else {
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err = get_compat_semid_ds(&s64, compat_ptr(pad));
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}
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up64 = compat_alloc_user_space(sizeof(s64));
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if (copy_to_user(up64, &s64, sizeof(s64)))
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err = -EFAULT;
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if (err)
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break;
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fourth.__pad = up64;
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err = sys_semctl(first, second, third, fourth);
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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long compat_sys_msgsnd(int first, int second, int third, void __user *uptr)
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{
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struct compat_msgbuf __user *up = uptr;
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long type;
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if (first < 0)
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return -EINVAL;
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if (second < 0)
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return -EINVAL;
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if (get_user(type, &up->mtype))
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return -EFAULT;
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return do_msgsnd(first, type, up->mtext, second, third);
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}
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long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
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int version, void __user *uptr)
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{
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struct compat_msgbuf __user *up;
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long type;
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int err;
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if (first < 0)
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return -EINVAL;
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if (second < 0)
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return -EINVAL;
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if (!version) {
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struct compat_ipc_kludge ipck;
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err = -EINVAL;
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if (!uptr)
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goto out;
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err = -EFAULT;
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if (copy_from_user (&ipck, uptr, sizeof(ipck)))
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goto out;
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uptr = compat_ptr(ipck.msgp);
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msgtyp = ipck.msgtyp;
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}
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up = uptr;
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err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third);
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if (err < 0)
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goto out;
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if (put_user(type, &up->mtype))
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err = -EFAULT;
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out:
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return err;
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}
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static inline int get_compat_msqid64(struct msqid64_ds *m64,
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struct compat_msqid64_ds __user *up64)
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{
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int err;
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if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
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return -EFAULT;
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err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
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err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
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return err;
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}
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static inline int get_compat_msqid(struct msqid64_ds *m,
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struct compat_msqid_ds __user *up)
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{
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int err;
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if (!access_ok(VERIFY_READ, up, sizeof(*up)))
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return -EFAULT;
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err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
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err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
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return err;
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}
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static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
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struct compat_msqid64_ds __user *up64)
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{
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int err;
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if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
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return -EFAULT;
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err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
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err |= __put_user(m64->msg_stime, &up64->msg_stime);
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err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
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err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
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err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
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err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
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err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
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err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
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err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
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return err;
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}
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static inline int put_compat_msqid_ds(struct msqid64_ds *m,
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struct compat_msqid_ds __user *up)
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{
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int err;
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if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
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return -EFAULT;
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err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
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err |= __put_user(m->msg_stime, &up->msg_stime);
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err |= __put_user(m->msg_rtime, &up->msg_rtime);
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err |= __put_user(m->msg_ctime, &up->msg_ctime);
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err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
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err |= __put_user(m->msg_qnum, &up->msg_qnum);
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err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
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err |= __put_user(m->msg_lspid, &up->msg_lspid);
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err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
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return err;
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}
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long compat_sys_msgctl(int first, int second, void __user *uptr)
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{
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int err, err2;
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struct msqid64_ds m64;
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int version = compat_ipc_parse_version(&second);
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void __user *p;
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switch (second & (~IPC_64)) {
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case IPC_INFO:
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case IPC_RMID:
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case MSG_INFO:
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err = sys_msgctl(first, second, uptr);
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break;
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case IPC_SET:
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if (version == IPC_64) {
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err = get_compat_msqid64(&m64, uptr);
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} else {
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err = get_compat_msqid(&m64, uptr);
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}
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if (err)
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break;
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p = compat_alloc_user_space(sizeof(m64));
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if (copy_to_user(p, &m64, sizeof(m64)))
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err = -EFAULT;
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else
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err = sys_msgctl(first, second, p);
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break;
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case IPC_STAT:
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case MSG_STAT:
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p = compat_alloc_user_space(sizeof(m64));
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err = sys_msgctl(first, second, p);
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if (err < 0)
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break;
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if (copy_from_user(&m64, p, sizeof(m64)))
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err2 = -EFAULT;
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else if (version == IPC_64)
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err2 = put_compat_msqid64_ds(&m64, uptr);
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else
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err2 = put_compat_msqid_ds(&m64, uptr);
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if (err2)
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err = -EFAULT;
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break;
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default:
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err = -EINVAL;
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break;
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}
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return err;
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}
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long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
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void __user *uptr)
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{
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int err;
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unsigned long raddr;
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compat_ulong_t __user *uaddr;
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if (version == 1)
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return -EINVAL;
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|
err = do_shmat(first, uptr, second, &raddr);
|
|
if (err < 0)
|
|
return err;
|
|
uaddr = compat_ptr(third);
|
|
return put_user(raddr, uaddr);
|
|
}
|
|
|
|
static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
|
|
struct compat_shmid64_ds __user *up64)
|
|
{
|
|
if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
|
|
return -EFAULT;
|
|
return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
|
|
}
|
|
|
|
static inline int get_compat_shmid_ds(struct shmid64_ds *s,
|
|
struct compat_shmid_ds __user *up)
|
|
{
|
|
if (!access_ok(VERIFY_READ, up, sizeof(*up)))
|
|
return -EFAULT;
|
|
return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
|
|
}
|
|
|
|
static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
|
|
struct compat_shmid64_ds __user *up64)
|
|
{
|
|
int err;
|
|
|
|
if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
|
|
return -EFAULT;
|
|
err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
|
|
err |= __put_user(s64->shm_atime, &up64->shm_atime);
|
|
err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
|
|
err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
|
|
err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
|
|
err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
|
|
err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
|
|
err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
|
|
return err;
|
|
}
|
|
|
|
static inline int put_compat_shmid_ds(struct shmid64_ds *s,
|
|
struct compat_shmid_ds __user *up)
|
|
{
|
|
int err;
|
|
|
|
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
|
|
return -EFAULT;
|
|
err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
|
|
err |= __put_user(s->shm_atime, &up->shm_atime);
|
|
err |= __put_user(s->shm_dtime, &up->shm_dtime);
|
|
err |= __put_user(s->shm_ctime, &up->shm_ctime);
|
|
err |= __put_user(s->shm_segsz, &up->shm_segsz);
|
|
err |= __put_user(s->shm_nattch, &up->shm_nattch);
|
|
err |= __put_user(s->shm_cpid, &up->shm_cpid);
|
|
err |= __put_user(s->shm_lpid, &up->shm_lpid);
|
|
return err;
|
|
}
|
|
|
|
static inline int put_compat_shminfo64(struct shminfo64 *smi,
|
|
struct compat_shminfo64 __user *up64)
|
|
{
|
|
int err;
|
|
|
|
if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
|
|
return -EFAULT;
|
|
if (smi->shmmax > INT_MAX)
|
|
smi->shmmax = INT_MAX;
|
|
err = __put_user(smi->shmmax, &up64->shmmax);
|
|
err |= __put_user(smi->shmmin, &up64->shmmin);
|
|
err |= __put_user(smi->shmmni, &up64->shmmni);
|
|
err |= __put_user(smi->shmseg, &up64->shmseg);
|
|
err |= __put_user(smi->shmall, &up64->shmall);
|
|
return err;
|
|
}
|
|
|
|
static inline int put_compat_shminfo(struct shminfo64 *smi,
|
|
struct shminfo __user *up)
|
|
{
|
|
int err;
|
|
|
|
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
|
|
return -EFAULT;
|
|
if (smi->shmmax > INT_MAX)
|
|
smi->shmmax = INT_MAX;
|
|
err = __put_user(smi->shmmax, &up->shmmax);
|
|
err |= __put_user(smi->shmmin, &up->shmmin);
|
|
err |= __put_user(smi->shmmni, &up->shmmni);
|
|
err |= __put_user(smi->shmseg, &up->shmseg);
|
|
err |= __put_user(smi->shmall, &up->shmall);
|
|
return err;
|
|
}
|
|
|
|
static inline int put_compat_shm_info(struct shm_info __user *ip,
|
|
struct compat_shm_info __user *uip)
|
|
{
|
|
int err;
|
|
struct shm_info si;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
|
|
copy_from_user(&si, ip, sizeof(si)))
|
|
return -EFAULT;
|
|
err = __put_user(si.used_ids, &uip->used_ids);
|
|
err |= __put_user(si.shm_tot, &uip->shm_tot);
|
|
err |= __put_user(si.shm_rss, &uip->shm_rss);
|
|
err |= __put_user(si.shm_swp, &uip->shm_swp);
|
|
err |= __put_user(si.swap_attempts, &uip->swap_attempts);
|
|
err |= __put_user(si.swap_successes, &uip->swap_successes);
|
|
return err;
|
|
}
|
|
|
|
long compat_sys_shmctl(int first, int second, void __user *uptr)
|
|
{
|
|
void __user *p;
|
|
struct shmid64_ds s64;
|
|
struct shminfo64 smi;
|
|
int err, err2;
|
|
int version = compat_ipc_parse_version(&second);
|
|
|
|
switch (second & (~IPC_64)) {
|
|
case IPC_RMID:
|
|
case SHM_LOCK:
|
|
case SHM_UNLOCK:
|
|
err = sys_shmctl(first, second, uptr);
|
|
break;
|
|
|
|
case IPC_INFO:
|
|
p = compat_alloc_user_space(sizeof(smi));
|
|
err = sys_shmctl(first, second, p);
|
|
if (err < 0)
|
|
break;
|
|
if (copy_from_user(&smi, p, sizeof(smi)))
|
|
err2 = -EFAULT;
|
|
else if (version == IPC_64)
|
|
err2 = put_compat_shminfo64(&smi, uptr);
|
|
else
|
|
err2 = put_compat_shminfo(&smi, uptr);
|
|
if (err2)
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
|
|
case IPC_SET:
|
|
if (version == IPC_64) {
|
|
err = get_compat_shmid64_ds(&s64, uptr);
|
|
} else {
|
|
err = get_compat_shmid_ds(&s64, uptr);
|
|
}
|
|
if (err)
|
|
break;
|
|
p = compat_alloc_user_space(sizeof(s64));
|
|
if (copy_to_user(p, &s64, sizeof(s64)))
|
|
err = -EFAULT;
|
|
else
|
|
err = sys_shmctl(first, second, p);
|
|
break;
|
|
|
|
case IPC_STAT:
|
|
case SHM_STAT:
|
|
p = compat_alloc_user_space(sizeof(s64));
|
|
err = sys_shmctl(first, second, p);
|
|
if (err < 0)
|
|
break;
|
|
if (copy_from_user(&s64, p, sizeof(s64)))
|
|
err2 = -EFAULT;
|
|
else if (version == IPC_64)
|
|
err2 = put_compat_shmid64_ds(&s64, uptr);
|
|
else
|
|
err2 = put_compat_shmid_ds(&s64, uptr);
|
|
if (err2)
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case SHM_INFO:
|
|
p = compat_alloc_user_space(sizeof(struct shm_info));
|
|
err = sys_shmctl(first, second, p);
|
|
if (err < 0)
|
|
break;
|
|
err2 = put_compat_shm_info(p, uptr);
|
|
if (err2)
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
|
|
unsigned nsops, const struct compat_timespec __user *timeout)
|
|
{
|
|
struct timespec __user *ts64 = NULL;
|
|
if (timeout) {
|
|
struct timespec ts;
|
|
ts64 = compat_alloc_user_space(sizeof(*ts64));
|
|
if (get_compat_timespec(&ts, timeout))
|
|
return -EFAULT;
|
|
if (copy_to_user(ts64, &ts, sizeof(ts)))
|
|
return -EFAULT;
|
|
}
|
|
return sys_semtimedop(semid, tsems, nsops, ts64);
|
|
}
|